/**
 * 
 */
package math.utils;


/**
 * Collected methods which allow easy implementation of equals.
 * Rewritten from http://www.javapractices.com/topic/TopicAction.do?Id=17.
 *
 * Example use case in a class called Car:
 * 
public boolean equals(Object aThat){
  if ( this == aThat ) return true;
  if ( !(aThat instanceof Car) ) return false;
  Car that = (Car)aThat;
  return
    EqualsUtil.areEqual(this.name, that.name) &&
    EqualsUtil.areEqual(this.numDoors, that.numDoors) &&
    EqualsUtil.areEqual(this.gasMileage, that.gasMileage) &&
    EqualsUtil.areEqual(this.color, that.color) &&
    Arrays.equals(this.maintenanceChecks, that.maintenanceChecks); //array!
}
 * 
 *
 * Arrays are not handled by this class.
 * This is because the Arrays.equals methods should be used for
 * array fields.
 */
public final class EqualUtils {

	static public boolean areEqual(boolean aThis, boolean aThat){
		//System.out.println("boolean");
		return aThis == aThat;
	}

	static public boolean areEqual(char aThis, char aThat){
		//System.out.println("char");
		return aThis == aThat;
	}

	static public boolean areEqual(long aThis, long aThat){
		/*
		 * Implementation Note
		 * Note that byte, short, and int are handled by this method, through
		 * implicit conversion.
		 */
		//System.out.println("long");
		return aThis == aThat;
	}

	static public boolean areEqual(float aThis, float aThat){
		//System.out.println("float");
		return Float.floatToIntBits(aThis) == Float.floatToIntBits(aThat);
	}

	static public boolean areEqual(double aThis, double aThat){
		//System.out.println("double");
		return Double.doubleToLongBits(aThis) == Double.doubleToLongBits(aThat);
	}

	/**
	 * Possibly-null object field.
	 *
	 * Includes type-safe enumerations and collections, but does not include
	 * arrays. See class comment.
	 */
	static public boolean areEqual(Object aThis, Object aThat){
		//System.out.println("Object");
		return aThis == null ? aThat == null : aThis.equals(aThat);
	}
}